Since commit 2f853dd6b9a95d5b13ee8f9df762125e0588df5d, all generated headers are generated under the obj directory, which is already ignored.
@@ -3,8 +3,6 @@
*.a
*.so
*.so.1
-arch/*/bits/alltypes.h
config.mak
lib/musl-gcc.specs
-src/internal/version.h
/obj/